Abstract

Structure, optical, and magnetic properties of the anatase films fabricated by facing-target reactive sputtering were investigated. Structural analyses indicate that there are no impurity phases in the films and the grain size reaches maximum when Fe content is 0.017. The optical band gap of the films decreases with the increasing . Photoluminescence(PL) spectra show that direct and indirect band-to-band transitions coexist, and the indirect radiative recombination can be regarded as a one photon and two phonon coupling courses. The PL intensity due to oxygen vacancies enhances and the refractive index of the fims increases with the increasing . The films exhibit room-temperature ferromagnetism due to the oxygen vacancies.

Received 19 March 2009Accepted 08 June 2009Published online 10 August 2009

Acknowledgments:

This work was supported by National Science Foundation of China (Grant Nos. 50672064 and 50701033), the RFDP (Grant No. 20070056047), Natural Science Foundation of Tianjin City (Grant Nos. 06TXTJJC13900 and 08JCYBJC09400), and YFF of Tianjin University (Grant Nos. TJU-YFF-08B52 and TJU-YFF-08A05).